Grinding-rolls for flour-mills



(No Model.)

H. A. HU-BFPNBR.

GRINDING ROLLS FOR FLOURM ILLS.

BIO/386,014.

Patented July 10, 1888.

flea)? H, Elf/6281,"

NITED STATES PATENT OFFIcE.

HENRY A. HUEFFNER, on PALMER, ILLINOIS.

GRINDING-ROLLS FOR FLOUR-MILLS.

SPECIFICATION forming part of Letters Patent No. 386,014, dated July 10,1888.

' pair of rolls constructed and combined according to my invention. FigII is a cross-section taken on line II II, Fig. I. Fig. III is a detailhorizontal section taken on line III III, Fig. I.

My invention relates to corrugated rolls for reducing grain; and myinvention consists in f atures of novelty hereinafter fully described,and pointed out in the claims.

Referring to the drawings, 1 represents a .roll provided on its face orperiphery with corrugations 2. These corrugations are preferablyarranged spirally on the face of the roll, and they are made inserpentine or waving form, so that their working-edges will have agreater length, and consequently a greater amount of breaking-surfacethan corrugations of any other form would have.

I am aware that it is not new to produce rolls with corrugations runningin a direction spirally around the periphery of the roll; but I believeit to be my invention to make these corrugations in serpentine or wavingform, as shown, thus producing a greater amount of breaking-surface, asmany more angles are produced between the corrugations of the two rolls.

The serpentine form of my corrugations is illustrated in Figs. I andIII; butI do not confine myself to any particular size of corrugations,as the same may be made small or large, as may be desired.

3 represents a roll on which the corrugations are the same as on roll 1,as regards the waving or serpentine shape, but which shows a greaternumber of corrugations, and conse' quently finer corrugations. This rollis preferably so arranged as to be driven faster than the one with thecoarser corrugations; or, in other words, the rolls are arranged to havedifferential speeds. The crests of the corru- Application filed June 6,1887. Serial No. 240,444.

(No model.)

gations are preferably made rounding, as shown in Fig. II.

The especial advantages of myimproved roll are that, in making thecorrugations of serpent-inc form, they present a greaterbreakingsurface, by reason of the greater extent of the crests of thecorrugations and the number of crossing angles between the corrugationsof the two rolls, and the concave sides of the corrugations on roll 1moving toward and coming opposite to the convex or opposite sides of thecurves on roll 3, provides a means by which the grains are crushed orbroken, as described, and I am thus enabled to make a greater percentageof break-flour than is obtainable with I the old form of rolls, and thecorrugations being serpentine or in curved waves, the tendency of thematerial to collect at one end or at any one point, as is the case withordinary spirally-arranged grooves, or grooves having a number of anglestherein, is avoided.

Iprefer, as stated, to arrange the corrugations spirally upon the roll,as well as making them serpentine, and I believe it to be-myinvention toconstruct a roll with curved serpentine or wavy corrugations arrangedspirally upon the face of a roll of a flour-mill.

I am aware, as stated, that it is not new to form corrugations spirallyon a roll, nor is it new to make the corrugations zigzagthat is to say,having several angular turns-but these form no part of my invention, theconstruction of which has obvious advantages over such forms, which havebeen hereinbefore set forth. What I claim as new, therefore, and desireto secure by Letters Patent, is-

1. As a new article of manufacture, a roll for flour-mills provided withcurved serpentine corrugations, substantially as set forth.

2. As a new article of manufacture, a roll for flour-mills provided withserpentine corrugations arranged spirally upon the face of the roll,substantially as set forth.-

3. The combination of two grinding-rolls, each provided with serpentinespiral corrugations, and one of said rolls having a finer dress than theother, as herein set forth.

HENRY A. HUEFFNER.

In presence of- J 0s. WAHLE, EDW. S. KNIGHT.

